EP0374545A2 - Commutateur - Google Patents

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Publication number
EP0374545A2
EP0374545A2 EP89122151A EP89122151A EP0374545A2 EP 0374545 A2 EP0374545 A2 EP 0374545A2 EP 89122151 A EP89122151 A EP 89122151A EP 89122151 A EP89122151 A EP 89122151A EP 0374545 A2 EP0374545 A2 EP 0374545A2
Authority
EP
European Patent Office
Prior art keywords
switch
switching device
sleeve
injection
molded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89122151A
Other languages
German (de)
English (en)
Other versions
EP0374545B1 (fr
EP0374545A3 (fr
Inventor
Reinhold Barlian
Otto Dr. Eberhardt
Karl-Heinz Lux
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0374545A2 publication Critical patent/EP0374545A2/fr
Publication of EP0374545A3 publication Critical patent/EP0374545A3/fr
Application granted granted Critical
Publication of EP0374545B1 publication Critical patent/EP0374545B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings

Definitions

  • the invention relates to a method for encapsulating a switch with the features of the preamble of claim 1 and a switching device produced by the method.
  • the switch to be encapsulated is introduced into a mostly multi-part housing, which is held together by plastic, screwed, glued or poured out and sealed.
  • These known manufacturing methods are costly and inevitably include several operations that can affect the function of the switch and the tightness of the encapsulation.
  • the object of the invention is to further develop a method for encapsulating a switch in such a way that a reduction in the amount of work and a switch closure that is gentle on the switch function is achieved with simple means, which has a high level of safety and can be used in particularly endangered surroundings.
  • An advantageous switching device produced by the method is characterized by the features of claim 2.
  • the switching device 1 includes a switch 2, which can preferably be designed as a microswitch.
  • the microswitch 2 has a plunger 3 which protrudes on the upper switch surface 4 in the drawing.
  • Electrical conductors 5 can be provided on the opposite lower side, which can be combined individually or in a hose line and Connections 6 on the underside 7 of the switch 2 can be fixed, for example, by means of screws, soldering or welding.
  • the conductors 5 have a cable lug 8 which is fixed at the connection 6.
  • the switch 2 In a plane above the connections 6, the switch 2 has two through bores 9 through which fastening screws or the like, not shown here, can be inserted.
  • a hood 10 is placed over the switch 2, which closely encloses the essentially rectangular microswitch 2 on the four side surfaces and on the upper switch surface 4.
  • the hood 10 At the top, the hood 10 has a guide sleeve 11 which can expediently be formed with the hood 10 in the same material.
  • a seal 13 which is preferably designed as an O-ring, can be provided, which can be mounted in an annular groove 14, which is expediently formed coaxially to the guide sleeve 12 on the end face facing the switch 2, and on the upper switch surface 4 is present, so that here a gas-tight seal is provided between the hood 10 or the guide sleeve 11 and the switch 2.
  • the seal 13 can be expediently made of a rubber-elastic material.
  • An actuator 15 can be mounted in a preferably stepped bore of the guide sleeve 11 in such a way that an ignition-resistant gap is formed.
  • the actuator 15 acts against the plunger 3 and can be rigid in the axial direction.
  • the actuator 15 cannot be rigid, but rather, according to the exemplary embodiment shown, be designed as a so-called overstroke segment and, for this purpose, have a pot-shaped lower part 16 and a hollow cylindrical head part 17, which can be pressed into the lower part 16 against the force of a helical compression spring 18 when the lower part 16 acting against the plunger 3 has been displaced axially downward against the switch 2.
  • the FIG. 1 clearly shows that both the lower part 16 and the head part 17 are axially guided in the guide sleeve 11 and that the telescopic head part 17 is also guided on the inner surface of the pot-shaped wall of the lower part 16.
  • the actuator 15 has a hood-shaped membrane 19 which has a bead-shaped peripheral edge 20.
  • the bead 20 is supported in a groove 21 formed on the upper end face of the guide sleeve 11.
  • the membrane 19 can have a stop 22 at the top, which rests on the head part 17 and on which an actuating lever 23 or the like can rest, which is pivotably mounted on an axis 24.
  • the actuating lever 23 can also be supported by a coil spring 25 shown in dashed lines. If the actuating lever 23 is pivoted downward against the force of the helical spring 25 and against the stop 22, the actuator 15 is displaced axially downward, so that the plunger 3 is immersed in the switch 2. If the actuation stroke is greater than the stroke required for the actuation of the plunger 3, the head part 17 of the actuator is immersed 15 in the lower part 16.
  • the switching device 1 has on the outside only a plastic injection-molded sleeve 26 which encloses the switch 2, the hood 10 with the guide sleeve 11 and the connections 6 with the conductors 5 in an explosion-protected manner, that is to say explosion-proof, preferably closely, so that there are no voids.
  • an injection molded edge 27 of the injection molded cover 26 overlaps the bead 20 of the membrane 19, so that the membrane edge 20 is clamped gas-tight in the guide sleeve groove 21.
  • the electrical conductors 5 are tightly and gas-tightly enclosed by the plastic injection-molded sleeve 26, so that the homogeneous plastic injection-molded sleeve 26 alone provides an absolutely sealed encapsulation of the switch 2 and the associated parts.
  • the injection molded encapsulation according to the invention consists of a homogeneous wall thickness which extends over the entire circumference, including all functional parts.
  • the switch parts can be encapsulated directly in a single injection molding operation, in which case both thermoplastic and thermosetting plastic can be injected as a hermetically sealed casing.
  • a major advantage is that after the completion of the spraying process, the hermetically sealed encapsulation is completely produced and no further sealing work as with the known switches is necessary, so that overall a technically better switching device and also a significant cost saving is achieved.
  • the gas-tight and explosion-proof plastic sleeve 26 produced by the injection molding process can have approximately the same wall thicknesses all around. In a preferred embodiment, however, it may be advantageous to design the lower part 32 of the injection-molded casing, in which the connections 6 and the electrical conductors 5 are embedded gas-tight, to be substantially thicker, for example five to ten times thicker, than the side walls of the plastic injection-molded casing 26, so that extremely long insulating distances are provided and safe use in an explosive atmosphere is guaranteed.
  • the switching insert 2 itself is not exposed to any risks with regard to damage or malfunction, so that a high level of security is provided for permanent functionality. Because of the injection molding encapsulation method according to the invention, no additional measures need to be taken for a careful sealing, since the preferably gas-tight encapsulation can take place directly in a single injection molding encapsulation process.

Landscapes

  • Manufacture Of Switches (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Thermally Actuated Switches (AREA)
EP89122151A 1988-12-21 1989-11-30 Commutateur Expired - Lifetime EP0374545B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3842960A DE3842960A1 (de) 1988-12-21 1988-12-21 Verfahren zum kapseln eines schalters und danach hergestellte schaltvorrichtung
DE3842960 1988-12-21

Publications (3)

Publication Number Publication Date
EP0374545A2 true EP0374545A2 (fr) 1990-06-27
EP0374545A3 EP0374545A3 (fr) 1991-09-04
EP0374545B1 EP0374545B1 (fr) 1995-03-08

Family

ID=6369681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89122151A Expired - Lifetime EP0374545B1 (fr) 1988-12-21 1989-11-30 Commutateur

Country Status (3)

Country Link
EP (1) EP0374545B1 (fr)
AT (1) ATE119708T1 (fr)
DE (2) DE3842960A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0591796A2 (fr) * 1992-10-05 1994-04-13 Reinhold Barlian Dispositif de commutation
WO2006032324A1 (fr) * 2004-09-17 2006-03-30 Huf Hülsbeck & Fürst Gmbh & Co. Kg Unite modulaire electrique comprenant un actionneur pour un circuit electrique dans un vehicule

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4312736C2 (de) * 1993-04-20 1998-09-10 Karl Kapfer Explosionsgeschütztes Microschalterbauteil
DE19719436C2 (de) * 1997-05-13 1999-06-17 Walter Soehner Gmbh & Co Spritzgußgehäuse
JP3722287B2 (ja) * 2002-06-11 2005-11-30 アサ電子工業株式会社 リミットスイッチ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1590938A1 (de) * 1966-09-12 1970-04-16 Oberweimar Elektroinstallation Schlagwetter- und explosionsgeschuetzter,druckfest gekapselter Einbaupaketschalter
DE2018763A1 (de) * 1970-04-18 1971-11-04 Schaltelektronik Veb K Verfahren zum Umhüllen von Schaltgeräten

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1197956B (de) * 1955-07-18 1965-08-05 Honeywell Inc Abgedichteter Schalter
CH399568A (de) * 1962-08-03 1965-09-30 Edwin Dr Guignard Hermetisch verschlossenes Gehäuse mit eingebautem, mechanisch betätigbarem elektrischen Schalter
FR2005015A1 (fr) * 1968-03-29 1969-12-05 Microprecision Electroni
DE8304932U1 (de) * 1983-02-23 1984-10-31 Kapfer, Karl, 7108 Möckmühl Explosionssicherer Leuchtschalter und Leuchttaster

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1590938A1 (de) * 1966-09-12 1970-04-16 Oberweimar Elektroinstallation Schlagwetter- und explosionsgeschuetzter,druckfest gekapselter Einbaupaketschalter
DE2018763A1 (de) * 1970-04-18 1971-11-04 Schaltelektronik Veb K Verfahren zum Umhüllen von Schaltgeräten

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0591796A2 (fr) * 1992-10-05 1994-04-13 Reinhold Barlian Dispositif de commutation
EP0591796A3 (fr) * 1992-10-05 1995-01-04 Reinhold Barlian Dispositif de commutation.
WO2006032324A1 (fr) * 2004-09-17 2006-03-30 Huf Hülsbeck & Fürst Gmbh & Co. Kg Unite modulaire electrique comprenant un actionneur pour un circuit electrique dans un vehicule

Also Published As

Publication number Publication date
DE3842960A1 (de) 1990-06-28
EP0374545B1 (fr) 1995-03-08
ATE119708T1 (de) 1995-03-15
DE3842960C2 (fr) 1990-11-08
DE58909088D1 (de) 1995-04-13
EP0374545A3 (fr) 1991-09-04

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